1216913608 has 8 divisors (see below), whose sum is σ = 2281713030. Its totient is φ = 608456800.

The previous prime is 1216913603. The next prime is 1216913617. The reversal of 1216913608 is 8063196121.

It can be written as a sum of positive squares in only one way, i.e., 979815204 + 237098404 = 31302^2 + 15398^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1216913603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76057093 + ... + 76057108.

Almost surely, 2^1216913608 is an apocalyptic number.

It is an amenable number.

1216913608 is a deficient number, since it is larger than the sum of its proper divisors (1064799422).

1216913608 is a wasteful number, since it uses less digits than its factorization.

1216913608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152114207 (or 152114203 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1216913608 is about 34884.2888418268. The cubic root of 1216913608 is about 1067.6279032174.

The spelling of 1216913608 in words is "one billion, two hundred sixteen million, nine hundred thirteen thousand, six hundred eight".